<template>
  <div class="q-pa-md">
    <t-table
      style="height: 400px"
      flat
      bordered
      ref="tableRef"
      title="Treats"
      :rows="rows"
      :columns="columns"
      :table-colspan="9"
      row-key="index"
      virtual-scroll
      :virtual-scroll-item-size="48"
      :pagination="pagination"
      :rows-per-page-options="[0]"
      v-model:expanded="expanded"
    >
      <template v-slot:header="props">
        <t-tr :props="props">
          <t-th auto-width />

          <t-th v-for="col in props.cols" :key="col.name" :props="props">
            {{ col.label }}
          </t-th>
        </t-tr>
      </template>

      <template v-slot:body="props">
        <t-tr :props="props" :key="`m_${props.row.index}`">
          <t-td auto-width>
            <t-toggle
              v-model="props.expand"
              checked-icon="add"
              unchecked-icon="remove"
              :label="`Index: ${props.row.index}`"
            />
          </t-td>

          <t-td v-for="col in props.cols" :key="col.name" :props="props">
            {{ col.value }}
          </t-td>
        </t-tr>
        <t-tr
          v-show="props.expand"
          :props="props"
          :key="`e_${props.row.index}`"
          class="q-virtual-scroll--with-prev"
        >
          <t-td colspan="100%">
            <div class="text-left"
              >This is expand slot for row above: {{ props.row.name }} (Index:
              {{ props.row.index }}).</div
            >
          </t-td>
        </t-tr>
      </template>
    </t-table>
  </div>
</template>

<script>
  import { onMounted, ref } from 'vue';

  const columns = [
    {
      name: 'desc',
      required: true,
      label: 'Dessert (100g serving)',
      align: 'left',
      field: row => row.name,
      format: val => `${val}`,
      sortable: true,
    },
    {
      name: 'calories',
      align: 'center',
      label: 'Calories',
      field: 'calories',
      sortable: true,
    },
    {
      name: 'fat',
      label: 'Fat (g)',
      field: 'fat',
      sortable: true,
      style: 'width: 10px',
    },
    { name: 'carbs', label: 'Carbs (g)', field: 'carbs' },
    { name: 'protein', label: 'Protein (g)', field: 'protein' },
    { name: 'sodium', label: 'Sodium (mg)', field: 'sodium' },
    {
      name: 'calcium',
      label: 'Calcium (%)',
      field: 'calcium',
      sortable: true,
      sort: (a, b) => parseInt(a, 10) - parseInt(b, 10),
    },
    {
      name: 'iron',
      label: 'Iron (%)',
      field: 'iron',
      sortable: true,
      sort: (a, b) => parseInt(a, 10) - parseInt(b, 10),
    },
  ];

  const seed = [
    {
      name: 'Frozen Yogurt',
      calories: 159,
      fat: 6.0,
      carbs: 24,
      protein: 4.0,
      sodium: 87,
      calcium: '14%',
      iron: '1%',
    },
    {
      name: 'Ice cream sandwich',
      calories: 237,
      fat: 9.0,
      carbs: 37,
      protein: 4.3,
      sodium: 129,
      calcium: '8%',
      iron: '1%',
    },
    {
      name: 'Eclair',
      calories: 262,
      fat: 16.0,
      carbs: 23,
      protein: 6.0,
      sodium: 337,
      calcium: '6%',
      iron: '7%',
    },
    {
      name: 'Cupcake',
      calories: 305,
      fat: 3.7,
      carbs: 67,
      protein: 4.3,
      sodium: 413,
      calcium: '3%',
      iron: '8%',
    },
    {
      name: 'Gingerbread',
      calories: 356,
      fat: 16.0,
      carbs: 49,
      protein: 3.9,
      sodium: 327,
      calcium: '7%',
      iron: '16%',
    },
    {
      name: 'Jelly bean',
      calories: 375,
      fat: 0.0,
      carbs: 94,
      protein: 0.0,
      sodium: 50,
      calcium: '0%',
      iron: '0%',
    },
    {
      name: 'Lollipop',
      calories: 392,
      fat: 0.2,
      carbs: 98,
      protein: 0,
      sodium: 38,
      calcium: '0%',
      iron: '2%',
    },
    {
      name: 'Honeycomb',
      calories: 408,
      fat: 3.2,
      carbs: 87,
      protein: 6.5,
      sodium: 562,
      calcium: '0%',
      iron: '45%',
    },
    {
      name: 'Donut',
      calories: 452,
      fat: 25.0,
      carbs: 51,
      protein: 4.9,
      sodium: 326,
      calcium: '2%',
      iron: '22%',
    },
    {
      name: 'KitKat',
      calories: 518,
      fat: 26.0,
      carbs: 65,
      protein: 7,
      sodium: 54,
      calcium: '12%',
      iron: '6%',
    },
  ];

  const seedSize = seed.length;

  let rows = [];
  for (let i = 0; i < 1000; i++) {
    rows = rows.concat(
      seed.map((r, j) => ({ ...r, index: i * seedSize + j + 1 })),
    );
  }

  const initialExpanded = rows.filter((r, i) => i % 3 === 0).map(r => r.index);

  export default {
    setup() {
      const tableRef = ref(null);

      onMounted(() => {
        tableRef.value.scrollTo(5000);
      });

      return {
        tableRef,

        expanded: ref(initialExpanded),
        columns,
        rows,

        pagination: {
          rowsPerPage: 0,
        },
      };
    },
  };
</script>
